Abstract
Purpose
Compound-specific stable isotopes (CSSIs) of very long-chain fatty acids (VLCFAs) of plant origin were investigated in a soil and sediment tracing context in a watershed in Manitoba, Canada. Spatial and temporal variability in δ13CFA values and concentrations was examined at the point, transect, and field scales to determine the (1) ability to differentiate sediment sources in C3-cropped fields, (2) impact of subsampling on source tracer fingerprints, and (3) major sediment source for a downstream mixture using the Bayesian unmixing model MixSIAR.
Materials and methods
Analysis was performed for five agricultural fields over six sampling periods. Soil and sediment samples (320) were processed for VLCFA analyses (C20:0–C30:0, C32:0). Quantification was performed by gas chromatography–flame ionization detection (GC-FID) and 13C determination by GC combustion–isotope ratio mass spectrometry (GCC-IRMS). Data were analyzed using weighted t tests to differentiate fields by δ13CFA values. The major sediment source was determined using the following steps: (1) a point-in-polygon approach to identify VLCFA tracers; (2) unmixing using MixSIAR; (3) source apportioning using VLCFA concentrations and %C.
Results and discussion
VLCFA δ13CFA values vary spatially within a cropped field due to environmental factors. Sediment source fingerprints are dependent on the variability in δ13CFA values and the quantitative combining of subsamples. Cropped fields that appeared homogeneous exhibited a large range in δ13CFA values, with variability greatest for fall and spring samples; concentrations were lowest at these times. Historical field boundaries played a role. A downstream sediment mixture (June 2013) was analyzed and found to correspond with source data from August 2012. Sediment mixture data (δ13CFA) for several VLCFAs were found to fall within the source mixing polygons produced by using two cultivated fields and a riparian zone sample as sources.
Conclusions
Variability in δ13CFA values increased in fall and spring, which could affect the number of subsamples required per source. Most fields could be spatially differentiated using a weighted t test, but not necessarily using the same VLCFA chain lengths. Two spatially separated fields with similar crop** histories were difficult to differentiate, but one of the fields was more prone to VLCFA losses. Only one of several source sampling periods led to successful unmixing, suggesting multiple sampling periods for source and/or mixture are necessary. Understanding the spatial and temporal variability affecting δ13CFA values in source sediments is particularly important for tracing studies using biomarkers in producing a representative fingerprint.
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Acknowledgments
We would like to thank the two anonymous reviewers for their time and effort in providing valuable feedback which we believe enhanced the manuscript. We would also like to thank Patrick Laceby for all his time, suggestions, and feedback, which further improved the quality of the manuscript.
This work is funded by a NSERC Strategic Grant STPGP 413426-2011—Development of environmental fingerprinting techniques for sources of sediment and associated phosphorus within agricultural watersheds of Canada—to D.A.L., P.N.O., and E.L.P. The purchasing of analytical equipment used in this project was made possible through the Canada Foundation for Innovation and the Western Economic Diversification Program. Analytical laboratory support was provided by Northern Analytical Laboratory Services (NALS) at UNBC. Additional thanks to the many undergraduate and graduate students at the University of Manitoba and UNBC who aided in the collection and processing of soil and sediment samples. This project would not have been possible without them.
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Reiffarth, D.G., Petticrew, E.L., Owens, P.N. et al. Spatial differentiation of cultivated soils using compound-specific stable isotopes (CSSIs) in a temperate agricultural watershed in Manitoba, Canada. J Soils Sediments 19, 3411–3426 (2019). https://doi.org/10.1007/s11368-019-02406-3
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DOI: https://doi.org/10.1007/s11368-019-02406-3